Checking and testing device for pilot-operated type surge relief valve

Abstract

The utility model relates to a pilot-operated type surge relief valve verification test device, which comprises a mobile carrier, a liftable installation platform, a surge relief valve installation pipeline and a hydraulic input test system, a support frame is arranged on one side of the upper end of the mobile carrier, and the installation platform is arranged on the other side of the upper end of the mobile carrier and used for installing a pilot-operated type surge relief valve. The pilot-operated type water attack pressure release valve is installed on the support frame and adjusts the installation height of the pilot-operated type water attack pressure release valve, the water attack pressure release valve installation pipeline is installed on the support frame and connected and communicated with the pilot-operated type water attack pressure release valve, and the hydraulic input test system is installed on the mobile carrier, connected with the water attack pressure release valve installation pipeline and used for conveying hydraulic pressure to the water attack pressure release valve installation pipeline. The testing device has the advantages of being reasonable in structural design, convenient to move and operate, capable of pressurizing the pilot-operated type water attack pressure relief valve checking device, capable of simulating the water attack phenomenon generated by a long-distance pipeline and capable of testing the action condition of the pilot-operated type water attack pressure relief valve.

Description

Technical Field

[0001] The utility model relates to the technical field of a pilot-operated water hammer pressure relief valve, in particular to a pilot-operated water hammer pressure relief valve calibration and testing device. Background Art

[0002] In the long-distance pipeline system for the transportation of refined oil, the pipeline is long, the operating pressure is high, and the pipeline terrain is complex, which is prone to water hammer. Water hammer and abnormal pressure seriously threaten the safe operation of long-distance pipelines. In order to avoid the impact of abnormal pipeline water hammer on the pipeline, pilot water hammer pressure relief valves are installed at the pipeline pressure station, download station and other stations, inlet and outlet pipelines, and download pipelines. When water hammer phenomena such as excessive pressure in the pipeline system occur, the pilot water hammer pressure relief valve can release abnormal pressure and protect the safety of the pipeline.

[0003] During long-term operation, pilot-operated water-surge relief valves often experience malfunctions such as false pressure relief or non-pressure relief, which poses a serious safety hazard to production. Pilot-operated water-surge relief valves should be regularly maintained every year, including pressure relief pressure calibration, pressure relief experiments, and valve action tests. Pilot-operated water-surge relief valves that have been in operation for a long time should be disassembled and overhauled. After all maintenance work is completed, the pilot-operated water-surge relief valves need to be tested.

[0004] During the regular maintenance of the pilot-operated water hammer pressure relief valve, there is no corresponding device to provide a convenient and reliable testing platform. During periodic testing and overhaul, only online action testing of the pilot valve is carried out, resulting in incomplete verification and unreliable testing, which indirectly causes the pilot-operated water hammer pressure relief valve to frequently malfunction and seize, posing a safety hazard to the pipeline.

[0005] Based on this, in order to cheaply solve the calibration setting and water hammer simulation test of the pilot water hammer pressure relief valve used in long-distance pipelines and the diagnosis and treatment of the failure problems of binding and malfunction, it is necessary to provide a pilot water hammer pressure relief valve calibration test device. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a method for effectively overcoming the defects of the prior art.

[0007] The technical solution of the utility model to solve the above technical problems is as follows:

[0008] A pilot-operated water-surge pressure relief valve calibration and testing device comprises a mobile carrier, a liftable mounting platform, a water-surge pressure relief valve mounting pipeline and a hydraulic input test system. A support frame is provided on one side of the upper end of the mobile carrier. The mounting platform is mounted on the other side of the upper end of the mobile carrier and is used to install the pilot-operated water-surge pressure relief valve and adjust the installation height of the pilot-operated water-surge pressure relief valve. The water-surge pressure relief valve mounting pipeline is mounted on the support frame and is connected and communicated with the pilot-operated water-surge pressure relief valve. The hydraulic input test system is mounted on the mobile carrier and is connected to the water-surge pressure relief valve mounting pipeline and is used to deliver hydraulic pressure to the water-surge pressure relief valve mounting pipeline.

[0009] On the basis of the above technical solution, the present invention can also be improved as follows.

[0010] Furthermore, the above-mentioned mobile carrier includes a mobile cart.

[0011] Furthermore, the installation platform includes an installation table and a lifting device arranged at the lower end of the installation table, and the lifting device is installed at the upper end of the mobile carrier.

[0012] Furthermore, the lifting device is a hydraulic jack.

[0013] Furthermore, the hydraulic input test system includes an automatic hydraulic control device, which includes a hydraulic pump, an accumulator, a first pressure transmitter, a check valve and a second pressure transmitter. One end of the water surge relief valve installation pipeline is closed, and the other end is connected and communicated with the port of the pilot water surge relief valve through a flange port. A liquid storage tank is provided in the support frame, and the liquid inlet end of the hydraulic pump is located in the liquid storage tank. The outlet of the hydraulic pump is connected to the inlet of the check valve through a first pressure-conducting pipe. The outlet of the check valve is respectively connected to a first branch pipe and a second branch pipe. The first branch pipe is connected to the accumulator. The first valve and the first pressure transmitter are provided on the first branch pipe. The second valve is provided on the second branch pipe. A branch pipe connected to the accumulator The end is also connected to a third branch pipe, and a third valve is provided on the third branch pipe. The third branch pipe is connected in parallel with the second branch pipe and then connected to one end of the water hammer pressure relief valve installation pipeline. The upper part of the water hammer pressure relief valve installation pipeline is connected to the pressure gauge through the second pressure guiding pipe. The second pressure guiding pipe is provided with a fourth valve. The upper part of the water hammer pressure relief valve installation pipeline is connected to the second pressure transmitter through the third pressure guiding pipe. The third pressure guiding pipe is provided with a fifth valve. An exhaust port is provided on the pipe section between the fifth valve and the second pressure transmitter. The exhaust port is connected to an exhaust pipe. A sixth valve is provided on the exhaust pipe. A pilot pressure pipe is also connected to the pipe section between the fifth valve and the second pressure transmitter. The pilot pressure pipe is connected to the pilot valve of the pilot water hammer pressure relief valve.

[0014] Furthermore, the hydraulic input test system also includes a pressure controller, and the first valve, second valve, third valve, fourth valve and fifth valve are all solenoid valves, and the pressure controller is respectively connected to the hydraulic pump, the first pressure transmitter, the second pressure transmitter, the first valve, the second valve, the third valve, the fourth valve and the fifth valve.

[0015] Furthermore, the water hammer pressure relief valve installation pipeline is provided with a pressure relief port, the pressure relief port is connected to a pressure relief pipe, a seventh valve is provided on the pressure relief pipe, the seventh valve is a solenoid valve, and is connected to the pressure controller.

[0016] Furthermore, it also includes a manual hydraulic control device, and the manual hydraulic control device is connected to the exhaust pipe.

[0017] Furthermore, the manual hydraulic control device comprises a manual hydraulic pump, an outlet of which is connected to the exhaust pipe via a hose, and an inlet of which is connected to the liquid storage tank or other liquid source.

[0018] Furthermore, the top of the liquid storage tank is provided with a liquid filling port, and the bottom thereof is provided with a liquid discharge port with a valve.

[0019] The beneficial effects of the utility model are: reasonable structural design, easy mobility and operation, capable of pressurizing the pilot-operated water hammer pressure relief valve calibration device, and able to simulate the water hammer phenomenon of a long-distance pipeline to test the action of the pilot-operated water hammer pressure relief valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall front structure of the pilot-operated water hammer pressure relief valve calibration and testing device of the utility model.

[0021] Figure 2 It is a schematic diagram of the overall top view of the pilot-operated water hammer pressure relief valve calibration and testing device of the utility model;

[0022] Figure 3 It is a schematic diagram of the overall side structure of the pilot-operated water hammer pressure relief valve calibration and testing device of the utility model;

[0023] Figure 4 It is a structural schematic diagram of a pilot-operated water-surge pressure relief valve calibration and testing device without a water-surge pressure relief valve of the utility model.

[0024] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0025] 1. Mobile carrier; 2. Installation platform; 3. Water hammer pressure relief valve installation pipeline; 4. Pilot water hammer pressure relief valve; 6. Liquid storage tank; 7. Manual hydraulic control device; 11. Support frame; 21. Installation table; 22. Lifting device; 41. Pilot water hammer pressure relief valve pilot valve; 51. Hydraulic pump; 52. Accumulator; 53. First pressure transmitter; 54. Check valve; 55. Second pressure transmitter; 57. Pressure gauge; 58. Pilot pressure pipe; 59. Pressure controller; 61. Drain port; 311. Fourth valve; 312. Fifth valve; 313. Sixth valve; 314. Seventh valve; 561. First valve; 562. Second valve; 563. Third valve. DETAILED DESCRIPTION

[0026] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0027] Example: Figure 1 , 2 As shown in Figures 3 and 4, the pilot-operated water-surge pressure relief valve verification and testing device of the present embodiment comprises a mobile carrier 1, a liftable mounting platform 2, a water-surge pressure relief valve mounting pipeline 3 and a hydraulic input test system. A support frame 11 is provided on one side of the upper end of the mobile carrier 1. The mounting platform 2 is mounted on the other side of the upper end of the mobile carrier 1, and is used to mount the pilot-operated water-surge pressure relief valve 4 and adjust the mounting height of the pilot-operated water-surge pressure relief valve 4. The water-surge pressure relief valve mounting pipeline 3 is mounted on the support frame 11, and is connected and communicated with the pilot-operated water-surge pressure relief valve 4. The hydraulic input test system is mounted on the mobile carrier 1, and is connected to the water-surge pressure relief valve mounting pipeline 3, and is used to deliver hydraulic pressure to the water-surge pressure relief valve mounting pipeline 3.

[0028] The pilot-operated water-hammer pressure relief valve verification and testing device of the present embodiment applies pressure to the water-hammer pressure relief valve installation pipe 3 and the pilot-operated water-hammer pressure relief valve 4 according to a set pressure through a hydraulic input test system, and then checks the operation of the pilot-operated water-hammer pressure relief valve 4 to verify the pilot-operated water-hammer pressure relief valve 4. At the same time, it can simulate the abnormal pressure generated inside the pipeline when water hammer occurs in a long-distance pipeline, and test the operation of the pilot-operated water-hammer pressure relief valve.

[0029] In this embodiment, the mobile carrier 1 comprises a mobile trolley, through which the entire testing device can be flexibly moved to a target position for use.

[0030] Specifically, the mobile trolley comprises a vehicle base, a handrail arranged at one end of the vehicle base, and a plurality of running wheels arranged at the lower end of the vehicle base. Wherein, the running wheels adopt casters that can be locked in the prior art.

[0031] In this embodiment, the entire test device can withstand a pressure of (0-15) MPa and other required pressures. The size of the flange of the water surge relief valve installation pipeline 3 is made according to the flange size of the pilot water surge relief valve 4. The flanges of the two are butt-jointed and connected by bolts during installation.

[0032] As a preferred embodiment, the installation platform 2 includes an installation table 21 and a lifting device 22 disposed at the lower end of the installation table 21 , and the lifting device 22 is installed at the upper end of the mobile carrier 1 .

[0033] In the above embodiment, the height of the installation table 21 is adjusted by the lifting device 22, thereby adjusting the height of the pilot water hammer pressure relief valve 4 installed on the upper end of the installation table 21, so that the pilot water hammer pressure relief valve 4 can be well docked and installed with the water hammer pressure relief valve installation pipe 3 on the support frame 11.

[0034] In this embodiment, the lifting device 22 adopts a hydraulic jack of an adapted model. The upper surface of the installation table 21 is designed with a seat adapted to the pilot water hammer pressure relief valve 4 to ensure that the pilot water hammer pressure relief valve 4 is installed firmly.

[0035] As a preferred embodiment, the hydraulic input test system includes an automatic hydraulic control device, which includes a hydraulic pump 51, an accumulator 52, a first pressure transmitter 53, a check valve 54 and a second pressure transmitter 55. One end of the water surge relief valve installation pipeline 3 is closed, and the other end is connected and communicated with the port of the pilot water surge relief valve 4 through a flange port. A liquid storage tank 6 is provided in the support frame 11. The liquid inlet end of the hydraulic pump 51 is located in the liquid storage tank 6. The liquid outlet end of the hydraulic pump 51 is connected to the inlet of the check valve 54 through a first pressure pipe. The outlet of the check valve 54 is respectively connected to a first branch pipe and a second branch pipe. The first branch pipe is connected to the accumulator 52. The first branch pipe is provided with a first valve 561 and the first pressure transmitter 53 (the first pressure transmitter 53 is connected to the first branch pipe through a pipeline, and a valve D is provided on the pipeline). The second branch pipe is provided with a second valve 56 2. The end of the first branch pipe connected to the accumulator 52 is also connected to a third branch pipe, on which a third valve 563 is provided. The third branch pipe is connected in parallel with the second branch pipe and connected to one end of the water-surge pressure relief valve installation pipe 3. The upper part of the water-surge pressure relief valve installation pipe 3 is connected to the pressure gauge 57 through the second pressure guiding pipe. The second pressure guiding pipe is provided with a fourth valve 311. The upper part of the water-surge pressure relief valve installation pipe 3 is connected to the second pressure transmitter 55 through the third pressure guiding pipe. The third pressure guiding pipe is provided with a fifth valve 312. An exhaust port is provided on the pipe section between the fifth valve 312 and the second pressure transmitter 55. The exhaust port is connected to an exhaust pipe. A sixth valve 313 is provided on the exhaust pipe. A pilot pressure pipe 58 is also connected to the pipe section between the fifth valve 312 and the second pressure transmitter 55. The pilot pressure pipe 58 is connected to the pilot valve 41 of the pilot water-surge pressure relief valve 4.

[0036] In the above implementation scheme, the hydraulic input test system adopts an automated calibration design, as follows:

[0037] When in use, enter the automatic verification mode, specifically:

[0038] Close the sixth valve 313 (the rest of the valves are open), set a suitable pressure, pressurize the system through the hydraulic pump 51, cooperate with the second pressure transmitter 55 to display the pressure value and the operation of the pilot water-surge pressure relief valve 4, adjust the pressure adjustment mechanism T of the pilot water-surge pressure relief valve (the pilot water-surge pressure relief valve 4 is provided with it, which belongs to the prior art and will not be described here), set the required value, check that the operation of the pilot water-surge pressure relief valve 4 meets the predetermined requirements, and then the pressure setting is completed, stop the hydraulic pump 51, and then complete the pressure relief and the verification;

[0039] In addition, the entire device can realize the test mode of simulating water hammer phenomenon, as follows:

[0040] Close the sixth valve 313, set a suitable pressure, and press the system through the hydraulic pump 51. After the initial pressing is completed, close the third valve 563 and the first valve 561, set a suitable pressure again, control the hydraulic pump 51 to press the system according to the set pressure, and after the water hammer pressure setting pressing in the accumulator 52 is completed, open the third valve 563 instantly, observe the action of the pilot water hammer relief valve 4, and complete the simulated water hammer phenomenon test.

[0041] As a preferred embodiment, the hydraulic input test system further includes a pressure controller 59, and the first valve 561, the second valve 562, the third valve 563, the fourth valve 311 and the fifth valve 312 are all solenoid valves. The pressure controller 59 is respectively connected to the hydraulic pump 51, the first pressure transmitter 53, the second pressure transmitter 55, the first valve 561, the second valve 562, the third valve 563, the fourth valve 311 and the fifth valve 312.

[0042] In the above implementation scheme, the pressure controller 59 sets the pressure parameters according to the pressure values ​​of the first pressure transmitter 53 and the second pressure transmitter 55, and automatically controls the opening and closing of each valve connected thereto and the operating status of the hydraulic pump 51, thereby realizing automated control verification. When setting the pressure, the parameters can be set at the pressure controller 59.

[0043] As a preferred embodiment, the water hammer pressure relief valve installation pipeline 3 is provided with a pressure relief port, the pressure relief port is connected to a pressure relief pipe, a seventh valve 314 is provided on the pressure relief pipe, the seventh valve 314 is a solenoid valve, and is connected to the pressure controller 59.

[0044] In the above implementation scheme, after entering the automatic calibration mode, after the pressure setting is completed and the hydraulic pump 51 is stopped, the seventh valve 314 is opened through the pressure controller 59 to release the pressure, and the pressure release is completed automatically, which is very convenient.

[0045] As a preferred embodiment, it further comprises a manual hydraulic control device 7, and the manual hydraulic control device 7 is connected to the exhaust pipe.

[0046] In the above embodiment, manual punching (pressing) control is performed by the manual hydraulic control device 7, as follows:

[0047] Close the fifth valve 312, connect the manual hydraulic control device 7 to the exhaust port, open the sixth valve 313, use the manual hydraulic control device 7 to increase the pressure, cooperate with the second pressure transmitter 55 to display the pressure value, adjust the pressure adjustment mechanism T of the pilot water hammer pressure relief valve, set the required value, check the operation of the pilot water hammer pressure relief valve 4, complete the pressure setting, then complete the pressure relief, remove the pilot water hammer pressure relief valve 4, and complete the manual calibration mode.

[0048] In this embodiment, the manual hydraulic control device 7 includes a manual hydraulic pump (an existing product on the market, an adapted model can be used, and no further details are given here), the outlet of which is connected to the exhaust pipe through a hose, and the inlet of which is connected to the liquid storage tank 6 or other liquid source.

[0049] In this embodiment, the top of the liquid storage box 6 is provided with a liquid filling port, the liquid filling port is provided with a funnel (indicated by c in the figure) for easy liquid filling, and the bottom is provided with a liquid discharge port 61 with a valve.

[0050] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0051] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0052] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0054] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0055] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A pilot-operated water hammer relief valve calibration test device, characterized in that: The invention comprises a mobile carrier (1), a liftable installation platform (2), a water-surge pressure relief valve installation pipeline (3) and a hydraulic input test system. A support frame (11) is provided on one side of the upper end of the mobile carrier (1). The installation platform (2) is installed on the other side of the upper end of the mobile carrier (1) and is used to install a pilot water-surge pressure relief valve (4) and adjust the installation height of the pilot water-surge pressure relief valve (4). The water-surge pressure relief valve installation pipeline (3) is installed on the support frame (11) and is connected and communicated with the pilot water-surge pressure relief valve (4). The hydraulic input test system is installed on the mobile carrier (1) and is connected to the water-surge pressure relief valve installation pipeline (3) and is used to transmit hydraulic pressure to the water-surge pressure relief valve installation pipeline (3).

2. A pilot-operated water hammer relief valve calibration and testing device according to claim 1, characterized in that: The mobile carrier (1) comprises a mobile trolley.

3. A pilot-operated water hammer relief valve calibration and testing device according to claim 1, characterized in that: The installation platform (2) comprises an installation table (21) and a lifting device (22) arranged at the lower end of the installation table (21); the lifting device (22) is installed at the upper end of the mobile carrier (1).

4. A pilot-operated water hammer relief valve calibration and testing device according to claim 3, characterized in that: The lifting device (22) is a hydraulic jack.

5. A pilot-operated water hammer relief valve calibration and testing device according to any one of claims 1 to 4, characterized in that: The hydraulic input test system comprises an automatic hydraulic control device, which comprises a hydraulic pump (51), an accumulator (52), a first pressure transmitter (53), a check valve (54) and a second pressure transmitter (55). One end of the water surge relief valve installation pipeline (3) is closed, and the other end is connected and communicated with the port of the pilot water surge relief valve (4) through a flange port. A liquid storage tank (6) is provided in the support frame (11). The liquid inlet end of the hydraulic pump (51) is located in the liquid storage tank (6). The liquid outlet end of the hydraulic pump (51) is connected to the inlet of the check valve (54) through a first pressure guide pipe. The outlet of the check valve (54) is respectively connected to a first branch pipe and a second branch pipe. The first branch pipe is connected to the accumulator (52). The first valve (561) and the first pressure transmitter (53) are provided on the first branch pipe. The second valve (562) is provided on the second branch pipe. The first branch pipe is connected to the accumulator (52). The end is also connected to a third branch pipe, the third branch pipe is provided with a third valve (563), the third branch pipe is connected in parallel with the second branch pipe and then connected to one end of the surge relief valve installation pipeline (3), the upper part of the surge relief valve installation pipeline (3) is connected to a pressure gauge (57) via a second pressure guiding pipe, the second pressure guiding pipe is provided with a fourth valve (311), the upper part of the surge relief valve installation pipeline (3) is connected to the second pressure transmitter (55) via a third pressure guiding pipe, the third pressure guiding pipe A fifth valve (312) is provided on the pipe, an exhaust port is provided on the pipe section between the fifth valve (312) and the second pressure transmitter (55), the exhaust port is connected to an exhaust pipe, a sixth valve (313) is provided on the exhaust pipe, a pilot pressure pipe (58) is also connected to the pipe section between the fifth valve (312) and the second pressure transmitter (55), and the pilot pressure pipe (58) is connected to the pilot valve (41) of the pilot water-surge pressure relief valve (4).

6. A pilot-operated water hammer relief valve calibration and testing device according to claim 5, characterized in that: The hydraulic input test system further comprises a pressure controller (59), wherein the first valve (561), the second valve (562), the third valve (563), the fourth valve (311) and the fifth valve (312) are all solenoid valves, and the pressure controller (59) is respectively connected to the hydraulic pump (51), the first pressure transmitter (53), the second pressure transmitter (55), the first valve (561), the second valve (562), the third valve (563), the fourth valve (311) and the fifth valve (312).

7. A pilot-operated water hammer relief valve calibration and testing device according to claim 6, characterized in that: The water hammer pressure relief valve installation pipeline (3) is provided with a pressure relief port, the pressure relief port is connected to a pressure relief pipe, and the pressure relief pipe is provided with a seventh valve (314), the seventh valve (314) is a solenoid valve, and is connected to the pressure controller (59).

8. A pilot-operated water hammer relief valve calibration and testing device according to claim 5, characterized in that: It also includes a manual hydraulic control device (7), and the manual hydraulic control device (7) is connected to the exhaust pipe.

9. A pilot-operated water hammer relief valve calibration and testing device according to claim 8, characterized in that: The manual hydraulic control device (7) comprises a manual hydraulic pump, the outlet of which is connected to the exhaust pipe via a hose, and the inlet of which is connected to the liquid storage tank (6) or other liquid sources.

10. A pilot-operated water hammer relief valve calibration and testing device according to claim 5, characterized in that: The top of the liquid storage box (6) is provided with a liquid filling port, and the bottom thereof is provided with a liquid discharge port (61) with a valve.

Images